Quick question? What causes the "you must restart your computer" (in 6 languages) gray screen of death message? I take it that is a kernel panic of some kind. What do i need to do to narrow down the problem?

I have a feeling it's my Marvel 88E1116 NIC. Just did a fresh install with 10.5.2 DVD and both nForce 4 chipset and forcedeth drivers selected, but still would not work. Had to go back to the old driver in this guide: http://forum.insanelymac.com/index.php?showtopic=73317

Also my system profiler shows my AMD X2 3600+ as 133mhz and FSB as 14mhz and only 1 core? Seems to run okay so i'm not worried just seems very odd. Thanks in advance.